Floor sponge



FIG. 1 is a top perspective view of a floor sponge showing my new design; and

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is top plan view thereof.

FIG. 4 is a bottom plan view thereof.

FIG. 5 is a side view thereof.

FIG. 6 is a side view thereof.

FIG. 7 is a front view thereof; and,

FIG. 8 is a rear view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a floor sponge, as shown and described. 